Replacing a TRANE high efficiency XB1000???? Help

My ac recently went out on me and I am unsure about replacing it with a used
unit for a lower cost, or going ahead and buying a brand new one. I'm selling
my house in the next year and was hoping to avoid having to buy and install a
brand new unit because when I had someone come do an estimate, they mentioned
all of the added costs that would be needed to update my entire system
throughout the house to fit newer models. My current ac was installed when the
house was built in 1999. If I buy a used unit, what years or models would be
compatible with the one I already have in place?? Please advise. :)

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